Useful js functions

utilities.js

// possible useful functions found on the web

//https://github.com/padolsey/string.prototype/blob/master/string.js

// left trim
String.prototype.ltrim = function () {
  return this.replace(/^\s+/, '');
};

// right trim
String.prototype.rtrim = function () {
  return this.replace(/\s+$/, '');
};

// replace inside a string
String.prototype.replaceAll = function(search, replace) {
  if (replace === undefined) {
    return this.toString();
  }
  return this.split(search).join(replace);
};

// dasherize string
String.prototype.dasherize = function() {
    return this.replace(/\W+/g, "-").toLowerCase();
};

// capitalize string
String.prototype.capitalize = function() {
    return this.charAt(0).toUpperCase() + this.slice(1);
};


// Array
// push into array if item does not alredy exists in it
Array.prototype.pushUnique = function (item){
    if(this.indexOf(item) == -1) {
        this.push(item);
        return true;
    }
    return false;
};

// change item position inside an array
Array.prototype.move = function (old_index, new_index) {
    if (new_index >= this.length) {
        var k = new_index - this.length;
        while ((k--) + 1) {
            this.push(undefined);
        }
    }
    this.splice(new_index, 0, this.splice(old_index, 1)[0]);
    return this; // for testing purposes
};

// insert element at index
Array.prototype.insertAt = function(element, index) {
    this.splice(index, 0, element);
};

// delete element from index
Array.prototype.removeAt = function(index) {
    this.splice(index, 1);
};

// get first element of array
Array.prototype.first = function() {
    return this[0] || undefined;
};

// get last element of array
Array.prototype.last = function() {
    if(this.length > 0) {
        return this[this.length - 1];
    }
    return undefined;
};

// get max in array
Array.prototype.max = function(array){
    return Math.max.apply(Math, array);
};

// get min in array
Array.prototype.min = function(array){
    return Math.min.apply(Math, array);
};


// DATE
// go to midnight
Date.prototype.toMidnight = function(){ 
  this.setMinutes(0); 
  this.setSeconds(0); 
  this.setHours(0);
};